#include "problems.h"
#include <iostream>
#include <chrono>

using namespace std;
using namespace chrono;

int main()
{
	steady_clock::time_point t_start = steady_clock::now();

	//cout << Problem1() << endl;
	//cout << Problem2() << endl;
	//cout << Problem3() << endl;
	cout << Problem4() << endl;
	steady_clock::time_point t_end = steady_clock::now();
	duration<double, milli> t_cost = duration<double, milli>(t_end - t_start);
	cout << t_cost << endl;
}